Sewing-machine.



. No. 850.642. v PATENTED APR. 16, 1907. T. D. HAMILTON, J. RUSK &' W.A. ROBERTSON.

SEWING MACHINE. APPLICATION FILED Jmms, 1906.

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THE NORRIS PETERS co., WASHINGTON, o. c

. PATENTED APR.16, 1907. T. 1). HAMILTON, J. RUSK & W. A. ROBERTSON.

iNo. 850,642.

SEWING MACHINE. APPLICATION FILED mums, 1906.

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' PAT'ENTEDAPR. 16, 1907. T. D. HAMILTON, J. RUSK &,W..A. ROBERTSON.

SEWING MACHINE.

APPLICATION FILED bums, 190s;

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UNITED sTATEs PATENT OFFICE. I

THOMAS DAVID HAMILTON, JOHN RUSK, AND WILLIAM AVONSIDE ROBERTSON, OFBELFAST, IRELAND.

SEWING-MACHINE.

Specification of Letters Patent.

'ratenteu April 16, 1907.

To all whom i2: may concern:

Be it known that we, THOMAS DAVID HAM- ILTON, of Cromac Square, Belfast,Ireland, linen manufacturer, JOHN RUsK, of Oromac Square, Belfast,Ireland, linen manufacturer, and WILLIAM AvoNsmE ROBERTSON, of 93Rathmore street, Belfast, Ireland, mechanic, subjects of the King ofGreat Britain, have invented certain new and useful Improvements inSewing-Machines, of which the following is a specification.

This invention relates to sewing-machines of that class inwhich theneedle-b ar is caused to move laterally while the cloth is being fed, soas to produce a zigzag stitch. At present in machines of this class itis usual to operate the needle-bar from the vibrating quadrant of themachine; but under our invent-ion we operate the bar (without the aid ofa quadrant) from a special cam or barrel arranged upon the arm of themachine and driven in any suitable manner. This cam or barrel is adaptedto actuatea bar which is connected, by means of a universal or othersuitable joint, to the needle-bar, so as to operate the same. The saidbar is or may be also adapted to be raised and lowered by means of alever operated by a knee, arm, or foot lever.

In order that our invention may be fully understood, we have hereuntoappended explanatory drawings, whereon Figure 1 is an elevation showingone method of carrying out our invention. Fig. 2 is a plan of same. Fig.3 is an elevation showing a second method of carrying out the invention.Fig. 4 is a plan of same.

In carrying out the invention according to the arrangement illustratedat Figs. 1 and 2 we make the sewing-machine with a plate a, which isfiXed to the arm I), and in the bracket 0/ of the plate is fixed a pinor shaft 0, on which runs freely a face-cam d, driven by means oftoothed gear 6 e from the needle-bar-operating shaft f of the machine.The cam d is or may be securely fixed to the toothed Wheel 6 (which alsoruns freely on the pin 0) by means of set-screws. Jointed, by means of auniversal or other suitable joint, to the needle-bar is an operating-rodg, which has at its end a roller h, bearing against the face of the cam65, thereby causing the rod 9 to have a lateral and longitudinalmovement. The roller 72. of the rod g is held in engagement with the camby means of a spring h, confined between the guide 0 and j a collar 7%,secured to the rod g, as seen 1n 1 Fig. 1, and the rod itself is given avarlable j travel by means of a lifting-rod t, which is bent at itsupper end and secured by an eye i to the rod 9 and which can be movedvertically by a knee, arm, or foot lever, the vertical movement beinglimited by a slotted guide 0 on the'plate a.

In the arrangement shown at Figs. 3 and 4: a tapered barrel-cam d isfitted on a countershaft p, projecting out through the side of the armand driven from the operating-shaft f by means of bevel-gearing g g. Inthis arrangement the operating-rod g is of a different shape, and itsroller It is pressed against the cam by a spring 8 on the rod betweenthe bracket 8 and a collar 3 on said rod, while it is pressed toward thearm by the action of a spring 1'. s is a guide for guiding the rod g.The rod can in this case be pushed outward or away from the arm andagainst the action of the spring 1" by means of an arm t at the end of abar a, carried in bearings y y and capable of being partially turned orrocked by the lifting-rod w, which can be raised by the knee or the armor foot in any well-known manner.

In Figs. 1 and 2 the face-cam as it revolves pushes the rod 9 to theleft hand, while the action of the spring brings it back again, therebyestablishing a reciprocating movement which vibrates the needle-barlaterally. The same result is obtained in Figs. 3 and 4 by means of thebarrel-cam, which gives the movements in one direction, while the spring8 gives the movements in the opposite direction. The throw or lateraltravel of the rod is in each case regulated by the knee, arm, or footlever. In Figs. 1 and 2 by actuating the rod t the roller it can beshifted vertically, so as to vary the throw or movement produced by thecam, and thereby vary the lateral movement of the needle-bar. In Figs. 3and 4 the bar 9 can be. shifted horizontally, so that the roller 71,will work on different parts of the cam, and thereby vary the lat l eralmovement of the needle-bar.

'Having now fully described our invention, what we claim, and desire tosecure by Letters Patent, is

1. In a sewing-machine, mechanism for moving the needle-bar laterally,the same comprising in combination, a cam, means for rotating the cam, arod connected with the needle-bar, means on said rod for direct contactWith said cam, a spring acting on said rod in opposition to said cam,and means for moving said rod and its cam-contacting melans verticallyto vary the throw of the r0 2. In a sewing-machine, mechanism forlaterally moving the needle-bar, comprising, in combination, a face-cam,means for supporting the cam, a spur-Wheel connected With the cam, meansfor rotating said. spur- Wheel, a rod connected with the needle-bar, aroller-on said rod adapted to contact With the face of the cam and a rodconnected to the rod aforementioned for the purpose of moving itvertically so that the roller can be acted on by different parts of thecam.

3. The combination in asewing-machine of a spur-pinion on the shaft ofthe machine, a cam, a spur-Wheel connected With the cam, means forsupporting the cam, a rod connected With the needle-bar, a roller at theend of said rod, a guide for the rod, a spring acting on said rod and asecond rod connected With the first one and adapted to shift the same toshift said roller on the said rod relatively to the cam with Which itcontacts.

In testimony whereof We affix our signatures in presence of twoWitnesses.

I THOMAS DAVID HAMILTON. JOHN RUSK. WILLIAM AVONSIDE ROBERTSON.Witnesses:

PAUL KNABENsHUE,

W. BRUCE R. I0Y.

